package com.twg.servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.twg.util.UploadHelper;

public class ListFileServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ListFileServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		//获取上传文件的目录
		String filePath = this.getServletContext().getRealPath(UploadHelper.PATH);
		//存储要下载的文件名
		Map<String,String> nameMap = new HashMap<String,String>();
		//递归遍历filepath目录下的所有文件和目录，将文件的文件名存储到map集合中
		UploadHelper.listFile(new File(filePath), nameMap);
		//将Map集合发送到listfile.jsp页面进行显示
		request.setAttribute("map", nameMap);
		request.getRequestDispatcher("../ListFile.jsp").forward(request, response);
		
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
